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Huawei U9500 Maintenance Manual

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U9500 Maintenance Guide
Issue
1.2
Date
2012-06-30
HUAWEI TECHNOLOGIES CO., LTD.

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Summary of Contents for Huawei U9500

  • Page 1 U9500 Maintenance Guide Issue Date 2012-06-30 HUAWEI TECHNOLOGIES CO., LTD.
  • Page 2 Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS"...

  • Page 3: About This Document

    Shu Yingfei 2012-05-02 V1.1 Added feedback about the Shu Yingfei first release. 2012-06-30 V1.2 Modified chapters 4, 7, and Feng Yifan 9 according to the service department opinions. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 4: Table Of Contents

    8 Assembly Procedure ........................29 8.1 Assembly Description ............................ 29 8.2 Assembly Procedure ............................29 9 Troubleshooting .......................... 35 9.1 Architecture Introduction ..........................35 9.2 Failure and Handling Process ......................... 40 Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 5 9.2.25 GSM RF Transmission Failure......................90 10 Functional Test .......................... 94 10.1 Keypad Introduction ............................. 94 10.2 MMI Test ..............................95 10.3 Wi-Fi Test ..............................97 10.4 Voice Call Test .............................. 97 Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 6: Product Overview

    U9500 Maintenance Guide 1 Product Overview Product Overview 1.1 Appearance Figure 1-1 shows U9500. Figure 1-1 U9500 1.2 Features Table 1-1 lists the product features. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 7 U9500 Maintenance Guide 1 Product Overview Table 1-1 U9500 product features Item Description Type Touchscreen smartphone Dimensions (H x W x D) 129.9 mm x 64.9 mm x 8.9 mm (5.11 in. x 2.56 in. x 0.35 in.) Working band ...
  • Page 8 Gravity sensitive, proximity sensitive, light sensitive, and gyroscope  Bluetooth 3.0, FM, and GPS/AGPS/GLONASS  High-speed WCDMA 3G/WLAN access  Huawei's android app store: Hi-space  Rich services in Hi-space Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 9: Applicable Scope And Precautions

    2.1 Applicable Scope This document provides repair instructions for technicians at service centers authorized by Huawei. This maintenance manual is confidential and accessible to authorized service centers (ASCs) and authorized service providers (ASPs) only. While every effort has been made to ensure the accuracy of this document, errors may still exist.

  • Page 10: Exploded View

    3.1 Exploded View The components listed in Figure 3-1 are structural parts of the phone, and cannot be used as reference when requesting spare parts. Figure 3-1 shows the U9500 exploded view. Figure 3-1 U9500 exploded view Battery cover Bluetooth...
  • Page 11 The list of components is provided for reference only. This list is subject to change without notice. The latest component list is available on Huawei's ITEM information system. If you have any questions, please contact the local technical support center.

  • Page 12: Layout Of Components On The Pcba

    Figure 4-1 and Figure 4-2 show the components on the top and bottom sides of the PCBA and failures that might occur because of damages to the components. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 13 U3104 3.3 V LDO U3106 Inv erter U3103 Lev el shifter chip Failure symptom: MHL failure Failure symptom: MHL Failure symptom: MHL failure failure Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 14 U4802 Transceiver power supply U3206 Load switch chip U4708 RF clock（26 MHz） Failure symptom: Failure symptom: network Failure symptom: network access camera failure registration failure failure Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 15: Software Upgrade

    Step 3 Install the microSD card to the phone and power the phone on. Step 4 Enter *#*#2846579#*#* in dialing mode. Choose ProjectMenu > Upgrade > microSD card upgrade, and touch Confirm. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 16: Forcible Upgrade

    Step 2 Check whether the upgrade file is stored in the right directory. Step 3 Check whether the upgrade method is correct. Step 4 Check whether the microSD card functions properly. Step 5 Perform the upgrade again. ---End Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 17: Repair Tools

    Name: soldering iron Usage: solders components Name: DC power supply Usage: powers the phone Name: soldering fixture Usage: secures the PCBA Name: lead-free solder wire Usage: soldering material Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 18 U9500 Maintenance Guide 6 Repair Tools Picture Description Name: digital multimeter Usage: measurement Name: toolkit Usage: assembling and disassembling Name: electric screwdriver Usage: fastens and removes screws Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 19: Disassembly Procedure

    7.2 Disassembly Procedure Wear ESD gloves when you remove the PCBA, antenna board, FPCs, and other electronic components. To disassemble a U9500, perform the following operations: Step 1 Remove the battery cover. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential...
  • Page 20 7 Disassembly Procedure Step 2 Remove the screws in the back over. Remove the hexagon screws in the four corners. Remove the two Phillips screws in the central part. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 21 U9500 Maintenance Guide 7 Disassembly Procedure Remove the four Phillips screws on both sides of the phone. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 22 U9500 Maintenance Guide 7 Disassembly Procedure Step 3 Remove the back cover. Step 4 Remove the volume keys and relevant FPCs. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 23 U9500 Maintenance Guide 7 Disassembly Procedure Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 24 The battery is packed using aluminum film and adhesive tapes. Exercise caution. Do not damage the film or the adhesive tapes. The battery cannot be used any more after being disassembled. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 25 U9500 Maintenance Guide 7 Disassembly Procedure Step 6 Remove the keypad backlight. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 26 U9500 Maintenance Guide 7 Disassembly Procedure Step 7 Remove the primary microphone. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 27 U9500 Maintenance Guide 7 Disassembly Procedure Step 8 Remove the coaxial cable. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 28 U9500 Maintenance Guide 7 Disassembly Procedure Step 9 Remove the antenna board. Remove the antenna board screws and then the antenna board. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 29 7 Disassembly Procedure Step 10 Remove the PCBA. Release the PCBA from the buckles, pull the PCBA downward to remove it, and disconnect the receiver BTB connector. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 30 7 Disassembly Procedure Step 11 Remove the receiver support. Use the tweezers to separate the Power key FPC from the PCBA and pry the receiver support off. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 31 U9500 Maintenance Guide 7 Disassembly Procedure Step 12 Remove the rear and front cameras. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 32 U9500 Maintenance Guide 7 Disassembly Procedure Step 13 Remove the flashlight FPC. ---End Figure 7-2 shows the phone components and disassembly tools. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 33 U9500 Maintenance Guide 7 Disassembly Procedure Figure 7-2 U9500 components and disassembly tools Back cover Volume key Battery Front cover assembly Battery cover assembly Main FPC Screws Coaxial cable Rear and front cameras Antenna board PCBA Receiver FPC Disassembly tools NOTE The TP and LCD are glued to the front cover using optical adhesive and cannot be removed.

  • Page 34: Assembly Procedure

    This document does not concern silica gel dispensing on the TP and joining the TP and front cover assembly. 8.2 Assembly Procedure To assemble a U9500, perform the following operations: Step 1 Attach the main antenna and Bluetooth antenna. Melt the positioning pin 1.
  • Page 35 BTB and tear away the conductive release paper on the front connector. cover in advance. Step 4 Install the sub-board and main FPC. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 36 PCBA. flashlight to the PCBA. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 37 Take a battery and tear the two Insert the two positioning pieces of release paper away Flat the connector head. pertuberances on the battery fromt the battery compartment. connector into the positioning slot. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 38 Note: Do not change the pointing in the same direction paper. speaker foot direction when as the arrow. you install the speaker. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 39 Attach the back label with aligning it cover is within the acceptable range. with the lines in the piture. ---End Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 40: Troubleshooting

    Figure 9-1 shows the architecture block diagram of U9500. Figure 9-1 Architecture block diagram of U9500 HUAWEI U9500 mobile phone is a flagship project of the year 2012. U9500 is a bar type smartphone that supports the combination of application processor (AP) and cellular modem (AP+MODEM).
  • Page 41 GPS antenna, Wi-Fi, antenna, and Bluetooth antenna. 0 shows the hardware block diagram of U9500Note: U9500 has no NFC or Cap key module. Figure 9-2 Hardware block diagram of U9500 Based on the functions, the PCBA can be divided into four subsystems: baseband (consisting of the AP, modem BB), RF, power, and user interfaces.
  • Page 42 Antenna Antennas, U9500 provides a built-in antenna supporting WCDMA at internal high and low frequency bands. U9500 provides a main interfaces, and antenna and Wi-Fi/Bluetooth/GPS antennas antenna protective units Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential...
  • Page 43 The phone provides headset interface for call output or headset interface MP3 output while the microphone is set on the earphone circuit, and line to transmit the sound to the phone. microphone interface circuit Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 44 A 32.768 kHz sleep clock is used for embedded RTC enhanced circuit to provide accurate time. functions HKADC 17-line 10 bit analog signal input supported. Dual I2C I2C controller and SMART REFLEX I2C. interfaces Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 45: Failure And Handling Process

    The power-key FPC is faulty, resulting in no response when you press the Power key. Damage or short-circuit on several components may cause the power-on failure. 0 and Figure 9-5 show these components. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 46 Press the Power key, and listen whether the vibrator vibrates. If the vibrator vibrates, the LCD is damaged. Change the LCD, and check whether the phone can be powered on. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 47: Excessive Current

    Large current is usually caused by short circuit. The current reaches 500 mA or above (the over-current protection value of a USB charger) when using DC power supply. For U9500, large current is usually caused by ground short circuit of VBAT and VPH_PWR.
  • Page 48 U9500 Maintenance Guide 9 Troubleshooting Figure 9-6 Components that might be short-circuited VBATT test points Handling Process Figure 9-7 shows the process for handling the excessive current power-on failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 49: Weak Current

    The low current ranges from 20 mA to several hundred mA. Figure 9-8 shows the components, damage on which can cause the weak current power-on failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 50 Resolder or replace Is the H_SYS_NRESPWR signal VCXO900 and U501. normal? Check if other circuits, especially Resolder or replace the U902 and U3201, are in U901. good condition. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 51: No Current

    If the DDR2 is faulty, resolder or replace the DDR2. If the DDR2 is in good condition, resolder or replace the AP (U301). 9.2.4 No Current Cause No current is usually caused by power supply channel absence, poor soldering, or power-key circuit faults. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 52 BTB connector Q1901 MOS diode Figure 9-11 Component that might be damaged J1301 Battery connector Handling Process Figure 9-12 shows the process for handling the no-current power-on failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 53: Charging Failure

    Is Q1901in Resolder or replace good condition? Q1901. Resolder or replace U901. 9.2.5 Charging Failure Circuit Diagram Figure 9-13 shows the charging circuit. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 54 Figure 9-14 Battery management circuit Cause The charging chip BQ24161 is specially used for U9500 for charging control. If U9500 operates properly but cannot be charged, check BQ24161 and replace it with U1901. If the phone still fails to be charged, the circuit monitoring the battery charge level may be faulty. In this case, replace U1301 to see whether the charging function resumes.

  • Page 55: Display Failure

    Figure 9-16 Component that might be damaged J1301 Battery connector 9.2.6 Display Failure Cause Figure 9-17 and Figure 9-18 show the components, damage on which can cause the display failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 56 Handling Process The U9500 LCD is connected to the PCBA using a BTB connector. The backlight LED is integrated with the LCD. When the display failure occurs, check whether the LCD BTB connector is properly fastened and whether U1600, U1601, and their peripheral components are damaged.

  • Page 57: Vibration Failure

    27 V. Replace the LCD. 9.2.7 Vibration Failure Cause Figure 9-20 and Figure 9-21 show the components, damage on which can cause the vibration failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 58 U901 PM chip Figure 9-21 Component that might be damaged J2203 Main FPC BTB connector Handling Process Figure 9-22 shows the process for handling the vibration failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 59: Microsd Card Detection Failure

    Resolder or replace U901. 9.2.8 microSD Card Detection Failure Cause Figure 9-23 and Figure 9-24 shows the components, damage on which can cause the microSD card detection failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 60 U901 PM chip Figure 9-24 Component that might be damaged J2101 microSD card holder Handling Process Figure 9-25 shows the process for handling the microSD card detection failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 61: Usim Card Detection Failure

    Resolder or replace U301 9.2.9 USIM Card Detection Failure Cause Figure 9-26 and Figure 9-27 show the components, damage on which can cause the USIM card detection failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 62 When the USIM card detection failure occurs, check whether the phone is set to the airplane mode. If the phone is not in airplane mode, perform steps listed in Figure 9-28. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 63: Tp Failure

    Resolder or replace U3801. 9.2.10 TP Failure Cause Figure 9-29 shows the components, damage on which can cause the TP failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 64 The TP is an independent component and shares multiplexing ports for power supply and communication with other unit circuits. You can perform the replacement test to locate the failure. Figure 9-30 shows the process for handling the TP failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 65: Light Sensor Failure

    9.2.11 Light Sensor Failure Cause Figure 9-31 and Figure 9-32 show the possible reasons that can cause the light sensor failure. Figure 9-31 Possible reason The component is smudged Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 66 Check whether J2202 is well Tighten J2202 and connected to the PCBA. the PCBA. Replace the sensor FPC. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 67: Acceleration Sensor Failure

    The acceleration sensor is damaged. Figure 9-34 shows the acceleration sensor. Figure 9-34 Acceleration sensor U2004 Acceleration sensor Handling Process Figure 9-35 shows the process for handling the acceleration sensor failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 68: Compass Failure

    9.2.13 Compass Failure Cause Figure 9-36 shows the component, damage on which can cause the compass failure. Figure 9-36 Component that might be damaged U2005 Compass chip Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 69: Gyroscope Failure

    9.2.14 Gyroscope Failure Cause Figure 9-38 shows the component, damage on which can cause the gyroscope failure. Figure 9-38 Component that might be damaged U2003 Gyroscope chip Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 70: Camera Failure

    U2003 replaced? Resolder or replace U301. 9.2.15 Camera Failure Cause Figure 9-40 and Figure 9-41 show the components, damage on which can cause the camera failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 71 There are three common types of camera failures:  Failure to access the camera application  (Rear camera) Failure to focus  Artifacts, black screen, or lines on the capture screen Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 72: Phone Audio Failure

    Figure 9-42 shows the components, damage on which can cause the phone audio failure. Figure 9-42 Components that might be damaged Handling Process for the Ringing Failure Figure 9-43 shows the process for handling the ringing failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 73 Rectify the faults on the microphone Check whether the sub-board, FPC flat signal circuit is in good cables, and relevant condition. signal circuits on the PCBA. Replace U1201. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 74: Headset Audio Failure

    PCBA. Resolder or replace U1201. 9.2.17 Headset Audio Failure Handling Process for the Headset Speaker failure. Figure 9-46 shows the process for handling the headset speaker failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 75 Rectify the faults on short-circuited。 the signal circuit. Replace U1201. Handling Process for Headset Microphone Failure Figure 9-47 shows the process for handling the headset microphone failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 76: Speaker Noice

    If the speaker is damped or interfered by scrap iron, speaker noise occurs. Figure 9-48 and Figure 9-49 show the possible causes for the speaker noise problem. Figure 9-48 Possible cause 1 There are foreign matters in this area. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 77 Figure 9-49 Possible cause 2 The speaker is improperly installed or smudged by foreign matters. Handling Process Figure 9-50 shows the process for handling the speaker noise problem. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 78: Wi-Fi/Bluetooth Failure

    Does the phone function properly after having the front cover assembly replaced? Replace the back cover assembly. 9.2.19 Wi-Fi/Bluetooth Failure Circuit Diagram Figure 9-51 shows Wi-Fi and Bluetooth circuits. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 79 Figure 9-52 and Figure 9-53 show the components, damage on which can cause the Wi-Fi failure. Figure 9-52 Components that might be damaged Z3599 Filter U3501 RF switch U3401 FM/BT/WL three-in-one chip Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 80 9 Troubleshooting Figure 9-53 Components that might be damaged J3503/J3504 BT/WL antenna springs Handling Process Figure 9-54 and Figure 9-54 shows the process for handling the Wi-Fi/Bluetooth failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 81: Fm Failure

    Does the phone functions properly signal circuit. after having U3501 replaced? 9.2.20 FM Failure Cause Figure 9-55 and Figure 9-56 show the components, damage on which can cause the FM failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 82 J1500 Headset jack holder U3401 FM/BT/WL three-in-one chip Figure 9-56 Component that might be damaged U1201 Codec chip Handling Process Figure 9-57 shows the process for handling the FM failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 83: Gps Failure

    Does the phone function properly after having U3401 replaced? Replace U1201. 9.2.21 GPS Failure Circuit Diagram Figure 9-58 shows the GPS circuit. Figure 9-58 GPS circuit Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 84 Figure 9-59 Components that might be damaged U301/U301_POP Main Z3602 Band-pass GPS chip/DDR Z3601 Band-pass GPS filter filter U3699 TCX03601 GPS clock J3604 GPS antenna grounding spring U3601 GPS chip Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 85 U9500 Maintenance Guide 9 Troubleshooting Figure 9-60 Components that might be damaged J3602/3603 GPS antenna springs Handling Process Figure 9-61 shows the process for handling the GPS failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 86: Hdmi Failure

    Does the phone function properly after having U3601 replaced? Replace U301. 9.2.22 HDMI Failure Cause Figure 9-62 shows the components, damage on which can cause the HDMI failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 87 U3101 MHL chip U3103 Level switch U1900 USB switch U3104 3.3V LDO U3106 Inverter Handling Process Figure 9-63 shows the process for handling the HDMI failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 88 Check whether the MHL control circuit is U310 and components on the good condition. peripheral circuit respectively. Does the phone function properly after having U3103 replaced? Replace U301. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 89: Wcdma Rf Reception Failure

    Figure 9-64 and Figure 9-65 show the components, damage on which can cause the WCDMA RF reception failure. Figure 9-64 Components that might be damaged U3501 RF switch U2801 Audience U3801 Modem Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 90 U4802 Transceiver power supply U4701 Dual mode RF U4708 RF clock（26M） chip transceiver chip Handling Process Figure 9-66 shows the process for handling the WCDMA RF reception failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 91 Is the fault rectified after you replace the corresponding circuit according to the defective frequency band? Does the phone function properly after having U4701 replaced? Replace U3801. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 92: Gsm Rf Reception Failure

    Figure 9-67 and Figure 9-68 show the component, damage on which can cause the GPS RF reception failure. Figure 9-67 Components that might be damaged U3501 RF switch U2801 Audience U3801 Modem Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 93 U4802 Transceiver power supply U4701 Dual mode RF U4708 RF clock（26M） chip transceiver chip Handling Process Figure 9-69 shows the process for handling the GSM RF reception failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 94 Is the fault rectified after you replace the corresponding circuit according to the defective frequency band? Does the phone function properly after having U4701 replaced? Replace U3801. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 95: Gsm Rf Transmission Failure

    Figure 9-70 and Figure 9-71 show the components, damage on which can cause the GSM RF transmission failure. Figure 9-70 Components that might be damaged U3501 RF switch U2801 Audience U3801 Modem Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 96 U4802 Transceiver power supply U4701 Dual mode RF transceiver U4708 RF clock (26M） chip chip Handling Process Figure 9-72 shows the process for handling the GSM RF transmission failure. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 97 Does the phone function properly after having U4701 replaced? Is the fault rectified after you replace the corresponding circuit according to the defective frequency band? Replace U3801. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 98 U9500 Maintenance Guide 9 Troubleshooting NOTE If all the RF indexes are abnormal, check the power supply circuit, antenna feedpoint, antenna switch board, antenna cable, and RF test socket. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 99: Functional Test

    Android smartphones, a Power key, volume up key, and volume down key. The battery used for U9500 cannot be removed. Therefore, the Power key is designed with a forcible power-off function, which facilitates scenarios, such as software upgrade. To forcibly power off the phone, press the Power key for at least 10s.

  • Page 100: Mmi Test

    Check whether the system records the data of ambient light and whether the data sensor test changes as the ambient light changes. Vibrator test The vibrator vibrates periodically. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 101 NOTE After the MMI test is completed, press the volume down key to display displays the test results, where the failed items are listed. Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 102: Wi-Fi Test

    If no problems are found, exit the voice call test. If any problems are found, troubleshoot the mobile phone or send it to an advanced service center for repair. ---End Issue 1.2 (2012-6-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

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